PubMed Journal Database | Journal of drug targeting 
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Showing PubMed Articles 1–25 of 70 from Journal of drug targeting
Gemcitabine-loaded smart carbon nanotubes for effective targeting to cancer cells.
Abstract Carbon nanotubes (CNTs) are the three-dimensional sp(2) hybridized nano-containers that have attracted considerable interest in drug delivery by offering potential advantages such as biocompatibility, non-immunogenicity, high loading efficiency, intrinsic stability and low toxicities. The aim of the present investigation was to assess the potential of gemcitabine-loaded folic acid (FA) conjugated multi-walled CNTs (GEM/FA-NT) for targeting to breast cancer cells. Pristine MWCNTs was functionalized...
Abstract Poly(lactide-co-glycolide) (PLGA) and lecithin/chitosan (LC) nanoparticles were prepared to evaluate the difference in the behavior upon administration on skin, for steroidal treatment. For this purpose, betamethasone-17-valerate (BMV)-loaded nanoparticles with a narrow size distribution and high entrapment efficiency were prepared. Permeation studies showed that both polymeric nanoparticles enhanced the amount of BMV in epidermis, which is the target site of topical steroidal treatment, when compa...
Bombesin peptide antagonist for target-selective delivery of liposomal doxorubicin on cancer cells.
Purpose: This study addresses novel peptide modified liposomal doxorubicin to specifically target tissues overexpressing bombesin (BN) receptors. Methods: DOTA-(AEEA)(2)-peptides containing the [7-14]bombesin and the new BN-AA1 sequence have been synthesized to compare their binding properties and in serum stabilities. The amphiphilic peptide derivative (MonY-BN-AA1) containing BN-AA1, a hydrophobic moiety, polyethylenglycole (PEG), and diethylenetriaminepentaacetate (DTPA), has been synthesized. Liposomes...
Enhancement on oral absorption of paclitaxel by multifunctional pluronic micelles.
The aim of the present study is to synthesize Pluronic F127-polyethylenimine-folate (PF127-PEI-FA) copolymer, construct a mixed micelle system with PF127-PEI-FA copolymer and Pluronic P123 (PP123) and to evaluate the potential of these mixed micelles as an oral drug delivery system for paclitaxel (PTX). The results of intestinal absorption revealed that the PTX-loaded micelles displayed superior permeability across intestinal barrier than free drug and PF127-PEI-FA/PP123 mixed micelles exhibited the stronge...
We aimed to assess the ability of (131)I-Pyrimethamine scintigraphy to detect the lesions of Toxoplasma gondii infection. An experimental model of toxoplasmosis was developed. The presence of toxoplasmosis was confirmed 60 days after implantation. Pyrimethamine was radioiodinated with I-131. The radioligand was validated by the requisite quality control tests to check its radiolabeling efficiency, in vitro stability and radiochemical purity etc. (131)I-Pyrimethamine (specific activity: 7.08 MBq/µmol) was i...
Dexamethasone conjugated multi wall carbon nanotubes (DEX-MWCNTs) were developed for controlled delivery of a doxorubicin HCl (DOX) with reduced toxicity. The DEX-MWCNTs were prepared by sequential functionalization of MWCNTs. The DOX was physically loaded onto the purified raw MWCNTs and DEX-MWCNTs at pH 7.4 phosphate buffer solutions (PBS) and evaluated for entrapment efficiency, in vitro release, hemolytic toxicity and ex vivo studies on "A-549" lung epithelial cancer cell line. DOX was efficiently loade...
Purpose: We used two ligand-modified liposomal drugs to selectively deliver two different chemotherapeutics to tumor cells (TC) and tumor vasculature endothelial (TV) cells, and examined the therapeutic effect of altering the order of treatment administration, and the effect of the temporal spacing of the treatments on the accumulation of a second dose of liposomes and therapeutic activity. Methods: Studies were completed in an orthotopic mouse model of human epidermal growth factor receptor 2 (HER2)-positi...
Background: Generally, chemotherapeutic drugs attack on both normal and tumor cells non-specifically causing life threatening side effects, necessitating targeted drug delivery to tumors. Purpose: The purpose of this study is to formulate albumin-based nanoparticles for tumor targeted drug delivery and noninvasive diagnosis. Methods: Albumin based nanoparticles (NPs) were developed as a potential tumor theragnostic agent by entrapping an anti cancer drug, doxorubicin and a near infrared dye, indocyanine gre...
Dual imaging of lung deposition and gene expression following the pulmonary delivery of a gene formulation is useful for a precise analysis of gene transfection efficiency in vivo. As a novel probe for evaluating lung deposition, in this study, a poly(ethylene glycol)-conjugated near-infrared fluorescent probe (PEG-NIRF) was newly synthesized, and compared with indocyanine green (ICG), for application to pDNA/polyethyleneimine (PEI) complex. PEG-NIRF had superior characteristics including a larger Stokes sh...
Preparation of gelatin hydrogels incorporating small interfering RNA for the controlled release.
The objective of this study is to design biodegradable hydrogels of gelatin for the controlled release of bioactive small interfering RNA (siRNA). Gelatin was cationized by chemically introducing ethylene diamine into the carboxyl groups in different conditions to obtain cationized gelatins (CGs). The CG was mixed with siRNA at various mixing ratios of amino groups of gelatin to the phosphate groups of siRNA in aqueous solution to form the siRNA-CGnano-complex. Gelatin together with the complex of siRNA and...
Professor Mitsuru Hashida: His outstanding achievements in drug delivery research.
Biological rationale for the design of polymeric anti-cancer nanomedicines.
Understanding the biological features of cancer is the basis for designing efficient anti-cancer nanomedicines. On one hand, important therapeutic targets for anti-cancer nanomedicines need to be identified based on cancer biology, to address the unmet medical needs. On the other hand, the unique pathophysiological properties of cancer affect the delivery and interactions of anti-cancer nanomedicines with their therapeutic targets. This review discusses several critical cancer biological properties that cha...
In this study, we developed oral in situ gelling formulations composed of pluronic (Plu) and polyacrylic acid (PAA) for the delivery of an anticancer drug, epirubicin (Epi). We investigated various Plu/PAA/Epi formulations for their physicochemical properties and in vitro permeation and accumulation, as well as for in vivo pharmacokinetic and antitumor efficacy. A scanning electron microscopic (SEM) image of Plu 14%/PAA 0.75%/Epi hydrogel showed a sponge-like structure. This formulation has suitable gelatio...
Strategies for non-invasive delivery of biologics.
Macromolecular therapeutics, in particular, many biologics, is the most advancing category of drugs over conventional chemical drugs. The potency and specificity of the biologics for curing certain disease made them to be a leading compound in the pharmaceutical industry. However, due to their intrinsic nature, including high molecular weight, hydrophilicity and instability, they are difficult to be administered via non-invasive route. This is a major quest especially in biologics, as they are frequently us...
Cryptococcosis is a leading mycological cause of mortality among immunologically compromised individuals. In order to develop an effective vaccine against Cryptococcus neoformans, the cytosolic proteins (Cp) of the pathogen have been used as an antigen in combination with different formulations. In the present study, we have demonstrated that Cp encapsulated poly-lactide co-glycolide (PLGA) microsphere further co-encapsulated into the biocompatible fibrin cross-linked plasma beads (Fib-PLGA-Cp) mediated cyt...
Liposomes and their applications in molecular imaging.
Molecular imaging is a relatively new discipline with a crucial role in diagnosis and treatment tracing of diseases through characterization and quantification of biological processes at cellular and sub-cellular levels of living organisms. These molecular targeted systems can be conjugated with contrast agents or radioligands to obtain specific molecular probes for the purpose of diagnosis of diseases more accurately by different imaging modalities. Nowadays, an interesting new approach to molecular imagin...
In recent years, cationic polymeric magnetic liposomes have shown greater stability and prolonged circulation half-life over traditional liposomes. Here, we examined the capability of cationic polymeric magnetic liposomes in delivering drugs into the brain under magnetic targeting with paclitaxel as the loaded agent. We found that the fabricated paclitaxel-loaded magnetic liposomes had a uniform diameter of 20 nm and were superparamagnetic. After they were injected into rats by the caudal vein, brain pacl...
Abstract Immunoliposomes (ILs) can be constructed to target the epidermal growth factor receptor (EGFR) to provide efficient intracellular drug delivery in tumor cells. We hypothesized that this approach might be able to overcome drug resistance mechanisms, which remain an important obstacle to better outcomes in cancer therapy. ILs were evaluated in vitro and in vivo against EGFR-overexpressing pairs of human cancer cells (HT-29 and MDA-MB-231) that either lack or feature the multidrug resistance (mdr) phe...
RVG peptide as transfection reagent for specific cdk4 gene silencing in vitro and in vivo.
The rabies virus glycoprotein (RVG) peptide is known as a transfection reagent for systemic delivery of small interfering RNA (siRNA) into the brain. However, selective transfection of neuronal cells or specific brain regions remains a problem. In the present study, we show that the RVG peptide can efficiently be used as shuttle system to transfect neuronal cells with cdk4 siRNA leading to selective knockdown of cdk4 expression in vitro and in vivo. After transfection, cdk4 expression was reduced up to 75%...
G-quadruplexes: targets and tools in anticancer drug design.
Background: Guanosine (G)-rich DNA and RNA sequences can adopt a defined secondary structure, the G-quadruplex, which consists of multiple stacked G-tetrads. Each G-tetrad has four Gs arranged in a planar configuration and held together by hydrogen bonding. G-quadruplexes are found in chromosomal DNA and RNA transcripts, particularly in telomeric sequences, and in regulatory regions of many genes including oncogenes. Purpose: This review summarizes how G-quadruplexes can be employed for anticancer therapies...
The delivery of nucleic acid molecules into cells to alter physiological functions at the genetic level is a powerful approach to treat a wide range of inherited and acquired disorders. Biocompatible materials such as cationic polymers, lipids, and peptides are being explored as safer alternatives to viral gene carriers. However, the comparatively low efficiency of nonviral carriers currently hampers their translation into clinical settings. Controlling the size and stability of carrier/nucleic acid complex...
Chitosan nanoparticles: a survey of preparation methods.
The application of macromolecules in therapy is frequently hindered by stability and/or permeation issues. These limitations have been addressed by the pharmaceutical industry through the development of suitable noninjectable drug carriers. In this context, nanoparticles have emerged as one of the most exciting tools due to the increased surface-to-volume ratio, which provides an intimate interaction with epithelial surfaces. Nanoparticles further enable the encapsulated molecules to retain their biological...
Targeted delivery of a novel palmitylated D-peptide for antiglioblastoma molecular therapy.
Effective glioblastoma treatment with low toxicity is one of the most difficult challenges in cancer therapy. The interaction between tumor suppressor protein p53 and its negative regulator murine double minute 2 (MDM2) provides a promising target for specific therapy because an important subtype of glioblastoma harbors wild-type p53 and overexpressed MDM2. Several D-peptides have been previously reported to effectively antagonize MDM2 for binding to p53 with high affinity and unsurpassed specificity. Howev...
MAP-mediated nuclear delivery of a cargo protein.
Radiolabeled cytochrome c (Cyt c), either as a free protein or as cell penetrating peptide (CPP)-conjugates, was tested for cellular uptake and nuclear transport in Human embryonic kidney293 (HEK293) cells and HeLa cells. Conjugation of Cyt c with either the amphipathic peptide model amphipathic peptide (MAP) or the cationic peptide oligoarginine via a disulfide linkage significantly increased the total internalization and nuclear localization of Cyt c in both cell lines, though to a greater extent followin...
